Email-in (`<user>@readest.com`) is now a paid feature. The other
Send channels — in-app /send page, mobile share-sheet, browser
extension — stay open to free users.
Three enforcement layers:
- `pages/api/send/address.ts` and `pages/api/send/senders.ts` return
403 with `{ code: 'plan_required', plan, requiredPlans }` for free
users. No `send_addresses` row is allocated on the blocked path.
`pages/api/send/inbox.ts` and `pages/api/send/inbox/file.ts` are
deliberately left open — they're shared with the file-upload and
extension channels.
- `workers/send-email` looks up `plans.plan` after resolving the
recipient and bounces (not silently drops) inbound mail for free
users with a one-sentence message pointing to upgrade plus the free
clip channels. Bounce rather than drop so a downgraded user
understands why their mail stops landing.
- `components/settings/integrations/SendToReadestForm.tsx` reads the
user's plan from the JWT before any API call. Free users see one
friendly card — headline, value prop, "View plans" CTA → /user, and
a softer line about the free alternatives — instead of address /
senders / activity sections of disabled controls. The
IntegrationsPanel NavigationRow stays visible so users can discover
the feature.
Single source of truth for the entitled tier set: `EMAIL_IN_PLANS` +
`isEmailInPlan(plan)` in `src/utils/access.ts`. Mirror copies live in
the Worker (no shared import surface) — keep them in sync.
Edge cases:
- Downgraded user: existing `send_addresses` row stays. All three
layers block; re-upgrading silently restores the same address.
- Loading flicker: `userPlan` starts as `null` so the loading skeleton
stays up rather than briefly flashing the upgrade card for a paid
user on a slow client.
12 new unit tests cover the gate on `/api/send/address` and
`/api/send/senders` (GET + POST blocked for free users, no Supabase
access on the blocked path, allowed for plus / pro / purchase).
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Huang Xin